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I propose that the "obf" shall be a unit of volume based on the total volume of beer consumed during a typical Oktoberfest. Statistics indicate that a reasonable equivalent would be about 6 million litres or about 1.5 million gallons (or about 5 acre-feet). The purpose is to equate large, abstract
volumes of liquid into something more comprehensible.
Example: According to the link, the average per-capita "water footprint" in the USA was 2480 cubic meters or about 650,000 gallons. Somewhat abstract, is it not? That would equate to a little under 0.5 obf. So a North American couple has a "water footprint" almost as large as all the beer consumed during Oktoberfest!
Other candidates not chosen for use as a unit of volume were the "mardigras" (abbr. "mdg") and the "Saint Patrick's day" (abbr. "SPd").
Water footprint data, circa 2007
Intended for use as an example of how the "obf" could be employed. [Gamma48, Jun 06 2009]
2499329.82944 litres in an olympic swimming pool
I don't know about one Oktoberfest, though... [fridge duck, Jun 07 2009]
||Usually one refers to a unit that is imaginable : a litre, one is familiar with, so 5.5 liters become imaginable too. To describe something not easily imagined (yearly consumption of water) by a fraction of something equally hard to imagine (octoberfest consumption of all attendants, during the whole time - how should one relate?). So either you have to make huge numbers imaginable (see my idea about a numbers implant), or you have to use a volume that is imaginable, as [bigsleep] did mentioning the olympic swimming pool.
||Does this unit change from year to year?
||So it's roughly two and a half Olympic swimming pools.